我正在为自己寻找一个解决方案，因为jQuery 1.9.1及以上已经删除了$。浏览器的功能。我想出了这个小函数。 它确实需要一个全局变量(我称之为mine _browser)来检查它是哪个浏览器。我已经写了一个jsfiddle来说明如何使用它，当然，它可以通过为_browser添加一个测试来扩展到其他浏览器。Foo，其中Foo是浏览器的名称。我只做了流行的。

detectBrowser ()

_browser = {}; function detectBrowser() { var uagent = navigator.userAgent.toLowerCase(), match = ''; _browser.chrome = /webkit/.test(uagent) && /chrome/.test(uagent) && !/edge/.test(uagent); _browser.firefox = /mozilla/.test(uagent) && /firefox/.test(uagent); _browser.msie = /msie/.test(uagent) || /trident/.test(uagent) || /edge/.test(uagent); _browser.safari = /safari/.test(uagent) && /applewebkit/.test(uagent) && !/chrome/.test(uagent); _browser.opr = /mozilla/.test(uagent) && /applewebkit/.test(uagent) && /chrome/.test(uagent) && /safari/.test(uagent) && /opr/.test(uagent); _browser.version = ''; for (x in _browser) { if (_browser[x]) { match = uagent.match( new RegExp("(" + (x === "msie" ? "msie|edge" : x) + ")( |\/)([0-9]+)") ); if (match) { _browser.version = match[3]; } else { match = uagent.match(new RegExp("rv:([0-9]+)")); _browser.version = match ? match[1] : ""; } break; } } _browser.opera = _browser.opr; delete _browser.opr; } detectBrowser(); console.log(_browser)

检查当前浏览器是否是Opera

if (_browser.opera) { // Opera specific code }

编辑修复了格式，修复了对IE11和Opera/Chrome的检测，从结果更改为browserResult。现在_browser键的顺序不重要了。更新了jsFiddle链接。

2015/08/11编辑为Internet Explorer 12 (EDGE)添加了新的测试用例，修复了一个小的regexp问题。更新了jsFiddle链接。

var ua = navigator.userAgent;

if (/Firefox\//.test(ua))
   var Firefox = /Firefox\/([0-9\.A-z]+)/.exec(ua)[1];

看看navigator。userAgent - Firefox/xxx.xxx. xxx。XXX是在结尾指定的。

var nVer = navigator.appVersion;
var nAgt = navigator.userAgent;
var browserName = navigator.appName;
var fullVersion = '' + parseFloat(navigator.appVersion);
var majorVersion = parseInt(navigator.appVersion, 10);
var nameOffset, verOffset, ix;

// In Opera 15+, the true version is after "OPR/" 
if ((verOffset = nAgt.indexOf("OPR/")) != -1) {
    browserName = "Opera";
    fullVersion = nAgt.substring(verOffset + 4);
}
// In older Opera, the true version is after "Opera" or after "Version"
else if ((verOffset = nAgt.indexOf("Opera")) != -1) {
    browserName = "Opera";
    fullVersion = nAgt.substring(verOffset + 6);
    if ((verOffset = nAgt.indexOf("Version")) != -1)
        fullVersion = nAgt.substring(verOffset + 8);
}
// In MSIE, the true version is after "MSIE" in userAgent
else if ((verOffset = nAgt.indexOf("MSIE")) != -1) {
    browserName = "Microsoft Internet Explorer";
    fullVersion = nAgt.substring(verOffset + 5);
}
// In Chrome, the true version is after "Chrome" 
else if ((verOffset = nAgt.indexOf("Chrome")) != -1) {
    browserName = "Google Chrome";
    fullVersion = nAgt.substring(verOffset + 7);
}
// In Safari, the true version is after "Safari" or after "Version" 
else if ((verOffset = nAgt.indexOf("Safari")) != -1) {
    browserName = "Safari";
    fullVersion = nAgt.substring(verOffset + 7);
    if ((verOffset = nAgt.indexOf("Version")) != -1)
        fullVersion = nAgt.substring(verOffset + 8);
}
// In Firefox, the true version is after "Firefox" 
else if ((verOffset = nAgt.indexOf("Firefox")) != -1) {
    browserName = "Mozilla Firefox";
    fullVersion = nAgt.substring(verOffset + 8);
}
// In most other browsers, "name/version" is at the end of userAgent 
else if ((nameOffset = nAgt.lastIndexOf(' ') + 1) < (verOffset = nAgt.lastIndexOf('/'))) {
    browserName = nAgt.substring(nameOffset, verOffset);
    fullVersion = nAgt.substring(verOffset + 1);
    if (browserName.toLowerCase() == browserName.toUpperCase()) {
        browserName = navigator.appName;
    }
}
// trim the fullVersion string at semicolon/space if present
if ((ix = fullVersion.indexOf(';')) != -1) fullVersion = fullVersion.substring(0, ix);
if ((ix = fullVersion.indexOf(' ')) != -1) fullVersion = fullVersion.substring(0, ix);

majorVersion = parseInt('' + fullVersion, 10);
if (isNaN(majorVersion)) {
    fullVersion = '' + parseFloat(navigator.appVersion);
    majorVersion = parseInt(navigator.appVersion, 10);
}

为什么不另一个解决方案:

navigator.userAgent.includes("Firefox")? log("Mozilla") :log("Chrome")

这让我有了火狐的版本，

    let versionNumber = parseInt(window.navigator.userAgent.match(/Firefox\/([0- 
    9]+)\./)[1]);